232 Dr. E. Koeliler on the Littoral Fauna of the 



porphyroidal by the development of large crystals of ortliose. 

 A remarkable fact is the tendency of the quartz to acquire a 

 granulitic appearance. From this result massifs or veins of 

 a granulite with very black and rather scarce mica, the most 

 distinct exposure of which is that observed near Mont Mado, 

 in the form of a band accompanied by quartzose veins with 

 sulphide of molybdenum." At those points where the syenite 

 does not come to the surface it is covered either by diluvium^ 

 as in the greater part of the centre of the island, or by argil- 

 laceous schists, as in the region of St. Aubin's Bay, or again 

 by petro-siliceous porphyries, conglomerates, and mclaphyres, 

 as is the case in the north and north-east of the island. 



St. Helier, the capital of the island, situated in the valley 

 of St. Sauveur, extends in a westerly direction along the most 

 eastern region of St. Aubin's Bay, and terminates towards the 

 south and east against a steep ridge about 160 feet high, 

 called Town Hill. Starting from Town Hill the coast, which 

 is quite low, runs at first towards the east and then bends a 

 little towards the south as far as the Witches rock ; it then 

 resumes its easterly direction as far as the Pointe de la Kocque, 

 presenting a shallow but very wide concavity which forms 

 St. Clement's Bay. Throughout this space between Town 

 Hill and the Pointe de la liocque the coast is lowest ; here 

 the retiring sea lays bare an immense extent of sands bestrewn 

 with rocks and becoming wider as we approach La Rocque, 

 the whole of which forms the Banc de Violet. The different 

 regions of these sands and rocks have received special names. 

 First comes the Havre des Pas, commencing at Town Hill 

 and bounded on the west by a series of rocks facing- 

 Elizabeth Castle, from which they are separated by a deep 

 gulf; the most advanced of these rocks is the Dog-Nest. 

 It is in the Havre des Pas that very large specimens of Car- 

 cinus mamas are often taken, whence the name of " Crabibre " 

 given by the inhabitants to this portion of the coast. This 

 station is pretty rich ; a very rare crustacean, Achmus 

 Cranchii, Leach, is found in it. 



Following the Havre des Pas comes the Gr^ve d'Azette, 

 sprinkled with rocks, the most important of which form the 

 masses called La Ponde and Le Croc, near the coast, the 

 Pocher-blanc and the Sambue, situated at the limit of the 

 lowest tides, and lastly La Mothe, which separates the Grfeve 

 d'Azette from St, Clement's Bay. 



The Gr^ve d'Azette, with the vast extent of ground which 

 is uncovered to the south-east of La Bocque, is the richest 

 station in the island. The sea in retiring forms numerous 

 shallow pools, presenting a strong vegetation of Zostene and 



